Composition with selective water plugging function as well as preparation method and application thereof

Abstract

The invention relates to the field of water plugging materials, and discloses a composition with a selective water plugging function and a preparation method, as well as the composition prepared according to the method and application thereof. Specifically, the composition comprises asphalt modified oil soluble resin, a main emulsifying agent and a water soluble polymer, wherein the main emulsifying agent is selected from a compound shown in a formula (I) and / or a compound shown in a formula (II), wherein R1 is alkyl of C12-C18; M1 is alkaline metal or alkaline-earth metal; R2 is alkyl or aralkyl of C12-C18; M2 is alkaline metal or alkaline-earth metal. The composition with the selective water plugging function is good in water plugging and oil releasing effects, and has temperature resisting and salt resisting performances and scouring resisting function; the composition is greatly applicable to high temperature and high salt selection criteria of reservoirs. R1O-SO3-M1 (formula I); R2-SO3-M2 (formula II).

Description

technical field [0001] The invention relates to the field of water shutoff materials, in particular to a composition with selective water shutoff function and a preparation method thereof, as well as the composition prepared by the method and its application. Background technique [0002] Polymer water shutoff materials are currently widely used water shutoff agents, which are mainly divided into polymer phase permeability regulators and polymer gel water shutoff agents. The main difference between the two is that the interpenetration modifier is mainly a long-chain polymer molecule, relying on the polymer molecular chain to stretch in the water phase and shrink in the oil phase, forming a dragging effect on the water phase and reducing the water phase penetration rate, the system will not cause physical plugging of pore volume, but the water plugging strength is not enough and the erosion resistance is poor. The polymer gel water shutoff agent uses the change of the effect...

AI Technical Summary

Problems solved by technology

[0005] To sum up, most of the selective plugging agents currently used in oil well water plugging are water-soluble polymers such as polyacrylamide and its derivatives to generate gel or jelly in the formation to seal formation water, or use oil The base plugging agent gels or solidifies when it meets water to block water channeling. However, due to its poor selectivity, it will greatly reduce the oil phase permeability while blocking water, resulting in low liquid after plugging, which restricts the application of oil well water plugging technology.